931400861 has 2 divisors, whose sum is σ = 931400862. Its totient is φ = 931400860.

The previous prime is 931400857. The next prime is 931400863. The reversal of 931400861 is 168004139.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 830016100 + 101384761 = 28810^2 + 10069^2 .

It is a cyclic number.

It is not a de Polignac number, because 931400861 - 2² = 931400857 is a prime.

Together with 931400863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (931400863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 465700430 + 465700431.

It is an arithmetic number, because the mean of its divisors is an integer number (465700431).

Almost surely, 2^931400861 is an apocalyptic number.

It is an amenable number.

931400861 is a deficient number, since it is larger than the sum of its proper divisors (1).

931400861 is an equidigital number, since it uses as much as digits as its factorization.

931400861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 931400861 is about 30518.8607421706. The cubic root of 931400861 is about 976.5898623080.

The spelling of 931400861 in words is "nine hundred thirty-one million, four hundred thousand, eight hundred sixty-one".